HD6473032F16 Datasheet, PDF (610/847 Pages) Renesas Technology Corp – Hardware Manual Renesas 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Series

Section 18 ROM
H8/3052B F-ZTAT
CSn
MD2
MD1
MD0
FWE
RES
System
control
unit
External
memory,
etc.
Figure 18.9 Recommended System Block Diagram
Notes: 1. The mode pin and FWE pin input must satisfy the mode programming setup time
(t_MDS) relative to the reset clear timing.
2. For notes on FWE pin High/Low, see section 18.11, Notes on Flash Memory
Programming/Erasing.
3. See section 4.2.2, Reset Sequence and 18.11, Notes on Flash Memory
Programming/Erasing. The H8/3052BF requires a minimum of 20 system clocks.
18.6.2 User Program Mode
When set to the user program mode, this LSI can erase and program its flash memory by executing
a user program. Therefore, on-chip flash memory on-board programming can be performed by
providing a means of controlling FWE and supplying the write data on the board and providing a
write program in a part of the program area.
To select this mode, set the LSI to on-chip ROM enable modes 5, 6, and 7 and apply a high level
to the FWE pin. In this mode, the peripheral functions, other than flash memory, are performed the
same as in modes 5, 6, and 7.
Since the flash memory cannot be read while it is being programmed/erased, place a programming
program on external memory, or transfer the programming program to RAM area, and execute it
in the RAM.
Figure 18.10 shows the procedure for executing when transferred to on-chip RAM. During reset
start, starting from the user program mode is possible.
Rev. 3.00 Mar 21, 2006 page 580 of 814
REJ09B0302-0300